Is this the reason _______ at the meeting for his carelessness in his work?
A．he explained?
B．what he explained?
C．how he explained?
D．why he explained?
A?
空白處引導(dǎo)定語從句，先行詞是reason，因B、C兩項不能引導(dǎo)定語從句，應(yīng)排除。D項有一定干擾性，因先行詞為the reason，但是，從句中缺少的是explained的賓語，不用why引導(dǎo)，應(yīng)用which或that或省略。
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